Liquid Behavior in Containers with a Liquid-Packing Bag for Liquid Products Subjected to Drop Impact

Abstract:

Article Preview

The behavior of liquid in containers subjected to impact loads due to free fall was
investigated using a visualization technique. Two types of containers were used. One consisted of a
case made of transparent plastic plates and a liquid-packing bag made of transparent plastic films. The
bag contained about 1,000 ml of liquid. The other was a case made only of transparent plastic plates.
The case contained about 1,000 ml of water. The liquid consisted of water and ethanol. Polyethylene
particles of about 3 mm in diameter were included in the liquid to visualize the movement of liquid in
the containers. The containers were subjected to impact due to free fall, and photographs of the
containers were taken using a high-speed camera. Results indicated that the behavior of liquid in the
container with a liquid-packing bag is different from that of the container without a liquid-packing
bag.

Abstract: Bend tests were performed at temperatures between 273 and 363 K for W-19vol%Cu,
W-22vol%Ag and W-19vol%(BAg-8) composites. Yield and/or maximum strengths and ductility
of the composite were discussed in terms of microstructure and fractography. Results are
summarized as follows. (1) Almost no difference was recognized in yield strength between the
composites. In contrast, a large difference was recognized in maximum strength and ductility
between the composites. Maximum strength and ductility of W-Ag and W-(BAg-8) composites
were generally much inferior to those of W-Cu composite. (2) Inferior mechanical properties of
W-Ag composite to W-Cu composite are attributed to heterogeneous distribution of Ag-phases,
whilst inferior mechanical properties of W-(BAg-8) composite to W-Cu composite are attributed to
large pores at grain boundaries.

Abstract: Selective Laser Sintering could manufacture high complex metal parts in short time but with high porosity and low strength. The components from Cold Isostatic Pressing have excellent performance with uniform organizational structure, high size precision, and high density. It, however, could not form high complex parts because of the difficulties of bag manufacture. So it will be a good method to combine Selective Laser Sintering and Cold Isostatic Pressing to make complicated metal parts. In this paper, the specimens of stainless steel were made by the combined Selective Laser Sintering and Cold Isostatic Pressing forming route. And the simulation of Cold Isostatic Pressing was carried out by finite element method and Drucker-Prager-Cap constitutive model in ABAQUS/Explicit computer program. The property of metal powder was measured by experiments. The effects of bag on Cold Isostatic Pressing have been discussed. It is different from the Cold Isostatic Pressing of metal powder that the bag has little influence on both shape and size of the specimen. The results of simulation show a good agreement between the experimental results and the calculated results. The simulation can give a useful direction to dimension and shape designs of the combined forming of Selective Laser Sintering and Cold Isostatic Pressing.

Abstract: With the computational fluid dynamics (usually being called “computational fluid dynamics” for CFD) method, the velocity field between the air nozzle and the filtering bag and the velocity distribution inside the filtering bag are computed when changing the distance between the air nozzle and the filtering bag. And the pressure distribution inside the filtering bag is also computed at different injecting times. According to the simulation result, this article has analyzed the influence of different distances between the air nozzle and the filtering bag and different injecting times on the dust-cleaning effect, and supplied theoretical basis to design the optimal pulse bag filter.

Abstract: In order to improve the quality of folding and increase the production efficiency in the process of airbag folding，a new airbag automatic folding device（AAFD） with programmable logic controller(PLC) as control unit and magnetic induction sensors as well as photoelectric sensors as trace positional parameters of rolling bag institutions has been developed. In addition, the important data of the device can also be stored by structured query language (SQL) which can query, update, and manage relational database system. The experimental results showed that, compared to a traditional AFD, the uniformity of gap during the production of airbag folding had been significantly improved, and the impact of human interference had also been reduced. Meanwhile, the device can produce a variety of types of products and also can ensure the quality of products, improve the production efficiency, and enhance the degree of standardization of the device.